/*
 * Copyright 2011 Philippe Blanc.
 * 
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 * use this file except in compliance with the License. You may obtain a copy of
 * the License at
 * 
 * http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations under
 * the License.
 */
package me.l1k3.fx.client.channel.trait;

public class Trait {
    private double start;
    private double end;
    private double diff;
    
    public final void set(double diff) {
        this.diff = end = diff;
    }
    
    public final void set(double start, double end) {
        this.start = start;
        this.end = end;
        diff = end-start;
    }
    
    public final double getDiff() {
        return diff;
    }
    
    public final double getStart() {
        return start;
    }
    
    public final double getEnd() {
        return end;
    }
    
    public final double get(boolean backward) {
        if(diff==0) return start;
        return backward? end : start;
    }
    
    public final double update(boolean backward, double progress) {
        if(diff==0) return start;
        return backward? (start+((1.0-progress)*diff)) : (start+(progress*diff));
    }
    
    public final void accumulate() {
        start += diff;
        end += diff;
    }
}
